WO2020259434A1

WO2020259434A1 - Battery pack and vehicle

Info

Publication number: WO2020259434A1
Application number: PCT/CN2020/097402
Authority: WO
Inventors: 游凯杰; 汪用广; 唐彧; 林伟龙; 马俊
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2019-06-27
Filing date: 2020-06-22
Publication date: 2020-12-30
Also published as: KR20220027160A

Abstract

A battery pack (100) and a vehicle. The battery pack (100) comprises a box body assembly (1), battery cells (2), a constraining component (3) and an outer cover (4). The box body assembly (1) comprises a box body (11) and fixed beams (12), and the fixed beams (12) are fixed in the box body (11). The battery cells (2) are disposed within the box body (11). The constraining component (3) covers the battery cells (2) and is fixed to the fixed beams (12).

Description

Battery pack and vehicle

Cross references to related applications

This disclosure is based on a Chinese patent application with application number 201910565257.4, application date on June 27, 2019, and invention title "Battery Pack and Vehicle", application number 201910710351.4, application date on August 2, 2019, invention title The Chinese patent application for "battery pack" and the application number is 201910794640.7, the filing date is August 27, 2019, and the Chinese patent application with the title of invention "battery pack" is the basis and its priority is claimed. These Chinese patent applications are The disclosure is hereby incorporated into the present disclosure as a whole.

Technical field

The present disclosure relates to the field of battery technology, and in particular to a battery pack and a vehicle.

Background technique

In recent years, rechargeable batteries have been widely used to power vehicles. Multiple rechargeable batteries are connected in series, in parallel or in series to achieve larger capacity or power.

In actual use, it is found that the outer cover of the battery pack has a large area and poor rigidity, and the battery cells will expand during the charging and discharging process, which makes the outer cover of the battery pack relatively deformed. The deformation of the outer cover of the battery pack will reduce the sealing performance of the outer cover and the box body, causing external water vapor to enter the battery pack and cause a short circuit problem. In addition, since the outer cover of the battery pack is deformed, it may hit other parts of the vehicle. When the battery pack needs to be removed from the vehicle for maintenance, it will be difficult to remove it from the vehicle and reattach it to the vehicle.

Summary of the invention

The embodiments of the present disclosure provide a battery pack and a vehicle, which can improve the sealing performance of the battery pack.

According to an aspect of the present disclosure, there is provided a battery pack including:

Box body components, including box body and fixed beam, fixed beam is fixed in the box body;

The battery cell is located in the box; and

The restraining component covers the battery cell and is fixed to the fixed beam.

In some embodiments, the battery pack further includes an outer cover, and the outer cover is arranged on a side of the restraining member away from the box body and closes the open end of the box body.

In some embodiments, the fixed beam divides the box into a plurality of accommodating cavities, the battery pack includes a plurality of battery cells, and the plurality of battery cells are divided into multiple groups in a plane perpendicular to the height direction. The monomers all have at least two battery monomers and are respectively arranged in different accommodating cavities.

In some embodiments, the battery pack includes a plurality of fixed beams, and each group of battery cells is provided with fixed beams on both sides along the grouping direction.

In some embodiments, a plurality of battery cells are grouped along the length direction of the battery pack, and the fixing beam extends along the width direction of the battery pack; and/or

The plurality of battery cells are grouped along the width direction of the battery pack, and the fixing beam extends along the length direction of the battery pack.

In some embodiments, the battery pack includes a plurality of restraint parts, and each restraint part respectively covers different groups of battery cells.

In some embodiments, the restraining component includes:

The limit part covers the battery cells of the corresponding group; and

The two mounting parts are respectively connected to the two sides of the limiting part along the battery cell grouping direction, and the two mounting parts are respectively fixed to the fixing beams on both sides of the battery cells of the corresponding group.

In some embodiments, the entire limiting portion protrudes away from the battery cell relative to the mounting portion.

In some embodiments, the constraining component has a split structure and covers at least part of the surface of the corresponding battery cell.

In some embodiments, there is a preset gap between the inner surface of the outer cover and the outer surface of the constraining component. In some embodiments, the preset gap ranges from 2 mm to 100 mm.

In some embodiments, the battery pack includes at least one of the following:

The first adhesive layer is arranged between the battery cell at the bottom layer and the bottom surface of the box body;

The second adhesive layer is provided between two adjacent battery cells in each group of battery cells; and

The third adhesive layer is between the high-sorry constraining component and the topmost battery cell.

In some embodiments, the battery cell includes:

Shell; and

An electrode assembly arranged in the housing, the electrode assembly including a first pole piece, a second pole piece, and a diaphragm arranged between the first pole piece and the second pole piece;

Wherein, the electrode assembly has a wound structure and is flat, and the outer surface of the electrode assembly includes two flat surfaces, and the two flat surfaces are arranged oppositely along the height direction; or,

The electrode assembly has a laminated structure, and the first pole piece and the second pole piece are stacked in a height direction.

In some embodiments, the battery pack further includes:

The pressure strip and the fastener, the installation part is arranged between the pressure strip and the fixed beam, and the fastener passes through the pressure strip and the installation part and is fixed to the fixed beam to fix the installation part on the fixed beam.

In some embodiments, the battery pack further includes a sealing element, which is arranged between the outer cover and the box body to close the open end of the box body.

In some embodiments, a fixed beam is provided between the battery cells of two adjacent groups, and the two adjacent installation parts fixed to one fixed beam each include a plurality of installation blocks, and the plurality of installation blocks are along the fixed beam. The extension direction is arranged at intervals, and a plurality of mounting blocks corresponding to two adjacent mounting parts are alternately arranged.

The box body assembly includes a box body and multiple fixed beams, each fixed beam is fixed to the box body, and the box body is divided into a plurality of accommodating cavities;

A plurality of battery modules, each battery module includes a plurality of battery cells, and each battery module is correspondingly disposed in each accommodating cavity; and

Multiple restraint parts, each restraint part includes a limit part, a first installation part and a second installation part, each limit part covers each battery module correspondingly, the first installation part and the second installation part are respectively connected On both sides of the limit part along the arrangement direction of the multiple fixed beams, and are respectively fixed with the fixed beams on both sides of the corresponding battery module;

Wherein, for two adjacent restraint members, the first installation part of one restraint member and the second installation part of the other restraint member are fixed to the same fixed beam and arranged in a height direction.

In some embodiments, the entire limiting portion protrudes in a direction away from the battery module relative to the first mounting portion and the second mounting portion,

There is a first distance L1 between the bottom surface of the first mounting portion and the top surface of the limiting portion, and there is a second distance L2 between the bottom surface of the second mounting portion and the top surface of the limiting portion;

Wherein, the first distance L1 is greater than the second distance L2.

In some embodiments, the three adjacent constraining components are a first constraining component, a second constraining component, and a third constraining component, and the first constraining component, the second constraining component, and the third constraining component are arranged along a plurality of fixed beams. The direction is set in sequence;

Wherein, the first installation portion of the first restraint member is located below the second installation portion of the second restraint member, and the first installation portion of the second restraint member is located below the second installation portion of the third restraint member.

In some embodiments, the entire restricting portion protrudes in a direction away from the battery module relative to the first mounting portion and the second mounting portion, and the two adjacent restricting members are the fourth restricting member and the fifth restricting member, respectively,

In the fourth restraining component, there is a first distance L1 between the bottom surface of the first mounting portion and the top surface of the limiting portion, and between the bottom surface of the second mounting portion and the top surface of the limiting portion;

In the fifth restraining component, there is a second distance L2 between the bottom surface of the first mounting portion and the top surface of the limiting portion, and between the bottom surface of the second mounting portion and the top surface of the limiting portion;

Wherein, the fourth constraining component and the fifth constraining component are alternately arranged along the arrangement direction of the plurality of fixed beams, and the first distance L1 is greater than the second distance L2.

In some embodiments, the thickness of the first mounting part is t, which satisfies L1-L2≥t.

In some embodiments, the battery pack further includes a plurality of fasteners,

The first mounting part is provided with a plurality of first mounting holes spaced along the length direction of the fixed beam, and the second mounting part superimposed on the first mounting part in the height direction is provided with a plurality of second mounting holes spaced along the length direction of the fixed beam hole;

Each fastener passes through the second mounting hole and the first mounting hole in the corresponding position in sequence and is fixed to the corresponding fixed beam.

In some embodiments, the first mounting part is located below the second mounting part superimposed on the first mounting part in the height direction, and the diameter of the second mounting hole is smaller than the diameter of the first mounting hole.

In some embodiments, reinforcing ribs are provided on the limiting portion.

In some embodiments, the constraining component has a split structure and covers at least part of the surface of the corresponding battery module.

In some embodiments, the battery pack further includes an outer cover, which is arranged on the side of the restraining member away from the battery module and closes the open end of the box.

In some embodiments, the battery pack includes at least one of the following:

The first adhesive layer is arranged between the bottom surface of each battery module and the inner bottom surface of the box;

The second adhesive layer is arranged between two adjacent battery cells in the battery module; and

The third adhesive layer is arranged between the top of each battery module and the restraining member.

A plurality of battery modules, each battery module includes a plurality of battery cells, and each battery module is correspondingly arranged in each accommodating cavity;

Multiple restraint parts, each restraint part includes a limit part, a first installation part and a second installation part, each limit part covers each battery module correspondingly, the first installation part and the second installation part are respectively connected On both sides of the limit part along the arrangement direction of the multiple fixed beams, and are respectively fixed to the fixed beams on both sides of the corresponding battery module; the first mounting part is provided with a plurality of first mounting holes at intervals along the length direction of the fixed beam, The second mounting portion is provided with a plurality of second mounting holes at intervals along the length direction of the fixed beam;

A plurality of first fasteners, the plurality of first fasteners respectively pass through the corresponding first mounting holes and are fixed to the fixing beam corresponding to the first mounting portion; and

A plurality of second fasteners, the plurality of second fasteners respectively pass through the corresponding second mounting holes and are fixed to the fixing beams corresponding to the second mounting portions,

Wherein, the adjustment amounts of the first mounting hole and the second mounting hole in the arrangement direction of the plurality of fixed beams are different.

In some embodiments, the first mounting hole is a round hole, and the second mounting hole is provided with an opening on the side wall away from the limiting portion. The opening penetrates in the thickness direction of the second mounting portion and is in the length direction of the fixing beam. The size of is not less than the diameter of the first connecting section of the second fastener.

In some embodiments, the distance between the side wall of the second mounting hole closest to the limiting portion and the side surface of the second mounting portion away from the limiting portion is greater than the diameter of the first connecting section of the second fastener.

In some embodiments, the diameter of the first mounting hole and the diameter of the arc section of the second mounting hole are the same.

In some embodiments, the first mounting hole is a round hole, and the second mounting hole is an oblong hole extending along the arrangement direction of the plurality of fixed beams.

In some embodiments, a plurality of beam mounting holes are provided on the fixed beam at intervals along its length, and the beam mounting holes are threaded holes;

A plurality of first fasteners respectively pass through the first installation hole and the beam installation hole and are fixed to the fixed beam corresponding to the first installation part, or a plurality of second fasteners respectively pass through the second installation hole and the beam installation in sequence Hole and fixed to the corresponding fixed beam. In some embodiments, a plurality of beam mounting holes are provided on the fixed beam at intervals along its length, and the beam mounting holes are light holes;

The battery pack also includes a plurality of blind rivet nuts. The blind rivet nut includes a second connecting section and a second limiting section. The second connecting section of each blind rivet nut is respectively embedded in each beam mounting hole. The second limiting section is connected to the fixing Top contact of beam;

A plurality of first fasteners respectively pass through the first mounting hole and the inner hole of the blind rivet nut and are fixed to the corresponding fixing beam, or a plurality of second fasteners sequentially pass through the second mounting hole and the inner hole of the blind rivet nut The inner hole is fixed to the corresponding fixed beam.

In some embodiments, the diameter of the first mounting hole and the diameter of the arc section of the second mounting hole are both larger than the outer size of the second limiting section.

In some embodiments, for two adjacent constraining components, the first mounting portion of one constraining component and the second mounting portion of the other constraining component are fixed to the same group of first fasteners or second fasteners. The same fixed beam, and superimposed in the height direction.

In some embodiments, the first mounting part is located above the second mounting part that is superimposed on the first mounting part in the height direction.

According to another aspect of the present disclosure, there is provided a vehicle including:

The vehicle body; and

In the battery pack of the above embodiment, the battery pack is provided in the vehicle body.

Based on the above technical solution, the battery pack of one embodiment of the present disclosure is provided with a restraining member and fixed with a fixed beam. When the battery cell expands, it can provide a stable and effective pressing force to the battery cell, and reduce the battery cell The degree of expansion and deformation; moreover, due to the setting of the restraining component, the deformation of the outer cover can be reduced, and the sealing performance of the battery pack can be improved.

Description of the drawings

The drawings described here are used to provide a further understanding of the present disclosure and constitute a part of the present application. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure, and do not constitute an improper limitation of the present disclosure. In the attached picture:

Figure 1 is an exploded schematic diagram of an implementation of the battery pack of the present disclosure;

Fig. 2 is a schematic structural diagram of the battery pack shown in Fig. 1 after the outer cover is opened;

3 is a cross-sectional view of the battery pack shown in FIG. 1 along the xz plane;

4 is a partial cross-sectional view of the internal structure of the battery pack of FIG. 2;

Figure 5 is a schematic diagram of a structure in which a bead and a seal are arranged in the battery pack;

Figure 6 is an exploded view of another embodiment of the battery pack of the present disclosure;

7 is a schematic diagram of the internal structure of the battery pack shown in FIG. 6 after the outer cover is opened;

Figure 8 is an exploded schematic diagram of an embodiment of a battery cell in a battery pack;

9 is a cross-sectional view of a battery cell using a wound electrode assembly along the xz plane in FIG. 8;

10 is a cross-sectional view of a battery cell using a laminated electrode assembly along the xz plane in FIG. 8.

FIG. 11 is a cross-sectional view along the xz plane of an embodiment of the battery pack of the present disclosure;

Fig. 12 is an exploded schematic diagram of the battery pack shown in Fig. 11;

Fig. 13 is a front view of the restraining component in the battery pack shown in Fig. 11;

Fig. 14 is a perspective view of a restraining component in the battery pack shown in Fig. 11;

Fig. 15 is an assembly diagram of the battery pack shown in Fig. 11 with the outer cover removed;

Fig. 16 is a partial enlarged view of M of the battery pack shown in Fig. 11;

Fig. 17 is a partial enlarged view of N in Fig. 16;

FIG. 18 is a schematic structural diagram of a rib that protrudes away from the battery module on the limiting portion of the restraining component in an embodiment of the battery pack of the present disclosure;

Figure 19 is a front view of Figure 18;

FIG. 20 is a schematic structural diagram of a constraining part of a battery pack according to an embodiment of the disclosure, which is provided with a convex rib protruding toward a direction close to the battery module;

Figure 21 is a front view of Figure 20;

FIG. 22 is a schematic structural diagram of an embodiment of the disclosed battery pack adopting a split type restraining component;

FIG. 23 is a schematic structural diagram of another embodiment of the battery pack of the present disclosure;

24 is a schematic diagram of the overall structure of some embodiments of the battery pack of the present disclosure cut along the xz plane;

FIG. 25 is a schematic structural diagram of some embodiments of the battery pack of the present disclosure where the restraining component is installed on the fixed beam;

FIG. 26 is an exploded view of some embodiments of the installation of the restraining component and the fixed beam in the battery pack of the present disclosure;

FIG. 27 is a schematic structural diagram of some embodiments of the restraining component in FIG. 26;

FIG. 28 is a top view of some embodiments of the battery pack of the disclosure where the restraining member is installed on the fixed beam;

Figure 29 is an enlarged view of A in Figure 28;

FIG. 30 is a side view of some embodiments of the battery pack of the present disclosure where the restraining member is installed on the fixed beam;

Figure 31 is an enlarged view of B in Figure 30;

Fig. 32 is an enlarged view of C in Fig. 31;

FIG. 33 is a top view of other embodiments in which the restraining member is installed on the fixed beam in the battery pack of the present disclosure;

34 is an exploded view of some embodiments of the battery pack of the present disclosure in which the first mounting part and the second mounting part of the adjacent restraining components are superimposed in the z direction;

Fig. 35 is a front view of some embodiments of the restraining component in Fig. 34;

Figure 36 is an enlarged view of D in Figure 24;

Figure 37 is an enlarged view of E in Figure 36;

FIG. 38 is an exploded view of other embodiments of the battery pack of the present disclosure in which the first mounting portion and the second mounting portion of the adjacent restraining components are superimposed in the height direction.

Detailed ways

The present disclosure is explained in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. The aspects defined as such can be combined with any other aspect or aspects, unless expressly indicated that they cannot be combined. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features considered to be preferred or advantageous.

The terms "first" and "second" appearing in the present disclosure are only for convenience of description, to distinguish different components with the same name, and do not indicate a sequence or a primary-secondary relationship.

In addition, when an element is referred to as being "on" another element, the element can be directly on the other element, or it can be indirectly on the other element with one or More intermediate components. In addition, when an element is referred to as being "connected to" another element, the element may be directly connected to the other element, or may be indirectly connected to the other element with one or more interposed therebetween. A middle element. In the following, the same reference numerals denote the same elements.

In the present disclosure, "multiple" refers to two or more (including two). Similarly, "multiple groups" refers to two or more (including two groups), and "multiple roots" refers to two or more. (Including two).

In order to clearly describe each orientation in the following embodiments, for example, the coordinate system in Figure 1, Figure 11, Figure 24 and Figure 34 defines the various directions of the battery pack. The x direction represents the length direction of the battery pack (hereinafter referred to as length Direction); the y direction indicates the width direction of the battery pack (hereinafter referred to as the width direction); the z direction is perpendicular to the plane formed by the x and y directions, indicating the height direction of the battery pack (hereinafter referred to as the height direction), when the battery pack is installed on the vehicle When the height direction of the battery pack is parallel to the vertical direction, the vertical direction mentioned here allows a certain angular deviation from the theoretical vertical direction. Based on this definition of orientation, "up", "down", "top" and "bottom" are used, all of which are relative to the height direction.

In some embodiments, the present disclosure provides a vehicle. The vehicle includes a vehicle body and a battery pack, and the battery pack is disposed in the vehicle body. Among them, the vehicle is a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. A drive motor is provided in the main body of the vehicle, and the drive motor is electrically connected to the battery pack. The battery pack provides electrical energy to drive the motor. The transmission mechanism is connected with the wheels on the vehicle body to drive the vehicle to travel. In some embodiments, the battery pack can be installed horizontally on the bottom of the vehicle body, and can be mounted on top and/or bottom supported.

Figures 1 to 5 are schematic structural diagrams of an embodiment of the disclosed battery pack. The battery pack 100 includes a box body assembly 1, a battery cell 2, a restraining component 3 and an outer cover 4.

The box assembly 1 includes a box body 11 and a fixed beam 12. The box body 11 has an open end, and the fixed beam 12 is fixed in the box body 11. For example, the fixed beam 12 can be fixed on the inner bottom surface or the side wall of the box body 11. on. The battery cell 2 is arranged in the box 11, the constraining component 3 covers the battery cell 2, and can contact or reserve a preset gap with the topmost battery cell 2, and the constraining component 3 is fixed to the fixed beam 12 and is configured To limit the battery cell 2 from swelling.

The outer cover 4 is arranged on the side of the restraining member 3 away from the box body 11 and is fastened to the open end of the box body 11 along the height direction of the battery pack to close the open end of the box body 11. The sealing here refers to the sealing connection between the outer cover 4 and the box body 11, which can prevent external liquid and water vapor from entering the battery pack and improve the safety performance of the battery pack.

The embodiment of the present disclosure is provided with the restraining member 3 and fixed with the fixing beam 12, when the battery cell 2 expands, it can provide a stable and effective pressing force to the battery cell 2 and reduce the degree of expansion and deformation of the battery cell 2; Moreover, since the restraining member 3 is provided, the deformation of the outer cover 4 can be reduced, and the sealing performance of the battery pack can be improved. In addition, the battery pack can reduce the deformation of the outer cover 4 by providing the restraining component 3. When the battery pack is used in a vehicle, it can be smoothly disassembled and assembled at the original installation position after long-term use, which can reduce the difficulty of battery pack maintenance and prevent The deformation of the battery pack exerts an external force on the mounting structure on the vehicle.

As shown in Figure 1, the fixed beam 12 divides the box 11 into a plurality of accommodating cavities 13, the battery pack includes a plurality of battery cells 2, and each battery cell 2 is divided into multiple groups in a plane perpendicular to the height direction Each battery cell 2 has at least two battery cells 2 and they are respectively arranged in different accommodating cavities 13. In some embodiments, the size of each accommodating cavity 13 is adapted to the overall external size of the corresponding battery cell 2.

In this embodiment, the battery cells 2 are arranged in groups and fixed by the restraining members 3 and the fixing beams 12 for grouping the battery cells 2, which is equivalent to adding a fixing point between the restraining members 3 and the box body 11. As a result, the span between each fixed point is reduced, and the deformation resistance of the constraining component 3 can be improved. Compared with the traditional solution of restraining all the battery cells as a whole through the cover, this embodiment applies fixed restraint to the outer periphery of each group of battery cells 2 individually. When the battery cells expand, the restraining part 3 is not easy to The deformation can further provide a stable pressing force to the battery cell 2 and prevent the size of the battery pack from increasing in the height direction, and it is not easy to squeeze the outer cover 4 due to the deformation of the restraining member 3, which can increase the service life of the battery pack.

Moreover, the battery cells 2 are arranged in groups, and when some of the battery cells 2 work to generate a large amount of heat and thermal runaway occurs, it can delay the diffusion of heat to the battery cells 2 of other groups, and improve the safety of the battery pack. Some battery cells 2 cannot be used normally, and the battery pack can also be used at reduced power.

As shown in FIG. 1, the battery pack includes a plurality of fixed beams 12, and fixed beams 12 are provided on both sides of each group of battery cells 2 along the grouping direction. The fixing beams 12 are not only arranged in the channel formed by the adjacent battery cells 2, but also on the side of the outermost battery cell 2 close to the inner wall of the box 11. The fixed beam 12 can be designed as a continuous structure in its extending direction, or can be designed as a segmented structure.

This structure can fix each group of battery cells 2 on both sides along the grouping direction to exert a more stable restraining force on the battery cells 2, thereby improving the restraining effect of the group of battery cells 2 and further restricting The battery cell swells, increasing the service life of the battery pack.

For example, each battery cell 2 is stacked in one or more layers in the height direction, for example, two layers are provided in FIG. 1. Each battery cell 2 is divided into multiple rows, and each row of battery cells 2 needs to be connected in parallel or in series through a bus bar, so there is a gap between two adjacent rows of battery cells 2.

Preferably, the distance between adjacent fixed beams 12 is configured to accommodate at most two rows of battery cells 2. In this way, the span between adjacent fixed beams 12 can be reduced as much as possible, so that the constraining component 3 and the fixed beam 12 have more fixed points, which can improve the deformation resistance of the constraining component 3 and improve the restraint of each battery cell 2 Reliability.

As shown in Figure 2, the box body 11 is provided with three fixed beams 12 extending in the width direction of the battery pack, which can be fixed on the inner bottom surface of the box body 11, and the middle fixed beam 12 is located between the two groups of battery cells 2. The fixed beams 12 on both sides are arranged close to the inner side wall of the box body 11, dividing the space in the box body 11 into two accommodating cavities 13, one of the accommodating cavities 13 (on the left in Figure 1) is for placing the first group of batteries The cell 20A, the first battery cell 20A includes a row of battery cells 2; the other accommodating cavity 13 (on the right in FIG. 1) is for the second battery cell 20B, and the second battery cell 20B includes Two rows of battery cells 2 arranged side by side and spaced in the longitudinal direction. Wherein, each column of battery cells 2 includes a plurality of battery cells 2 arranged side by side in the width direction, the side surfaces of two adjacent battery cells 2 are in contact, and each battery cell 2 is stacked in two layers in the height direction.

The extending direction of each fixing beam 12 is perpendicular to the grouping direction of each battery cell 2 to make the internal structure of the battery pack more compact. As shown in Fig. 1, a plurality of battery cells 2 are grouped along the length direction of the battery pack, and the fixed beam 12 extends along the width direction of the battery pack. This arrangement helps to divide each battery cell 2 into more groups. In order to increase the fixing point of the restraint member 3 and the box body 11, and to reduce the overall aspect ratio of each battery cell 2, the restraint stiffness of the restraint member 3 to each battery cell 2 in the length and width directions is balanced, Improve constraint reliability.

Optionally, a plurality of battery cells 2 are grouped along the width direction of the battery pack, and the fixed beam 12 extends along the length direction of the battery pack. Alternatively, a plurality of battery cells 2 can also be grouped along the length direction and the width direction of the battery pack at the same time, and each fixed beam 12 forms a grid structure.

For the specific structure of the fixed beam 12, a solid fixed beam or a hollow fixed beam can be used, and its cross section can be rectangular, trapezoidal or C-shaped, etc., and its upper surface can be set to a plane in order to fix the constraining component on the upper surface of the fixed beam 12. Optionally, the constraining component 3 can also be fixed to the side of the fixed beam 12.

Wherein, as shown in the exploded schematic view shown in FIG. 8, each battery cell 2 includes: a casing 21 and an electrode assembly 22 arranged in the casing 21. The casing 21 may have a hexahedral shape or other shapes and has an opening. The electrode assembly 22 is housed in the case 21. The opening of the housing 21 is covered with a cover plate assembly 24. The cover plate assembly 24 includes a cover plate 241 and two electrode terminals arranged on the cover plate. The two electrode terminals are a first electrode terminal 242 and a second electrode terminal 243 respectively. The first electrode terminal 242 may be a positive electrode terminal, and the second electrode terminal 243 is a negative electrode terminal. In other embodiments, the first electrode terminal 242 may also be a negative electrode terminal, and the second electrode terminal 243 is a positive electrode terminal. An adapter sheet 23 is provided between the cover plate assembly 24 and the electrode assembly 22, and the tabs of the electrode assembly 22 are electrically connected to the electrode terminals on the cover plate 241 through the adapter plate 23. In this embodiment, there are two adapter plates 23, namely, a positive electrode adapter plate and a negative electrode adapter plate.

As shown in FIG. 8, two electrode assemblies 22 are provided in the housing 21, and the two electrode assemblies 22 are stacked along the height direction (z direction) of the battery cell 2, wherein the height direction of the battery cell 2 is the same as that of the battery pack. The height direction is the same. Of course, in other embodiments, one electrode assembly 22 may also be provided in the housing 21, or more than three electrode assemblies 22 may be provided in the housing 21. The plurality of electrode assemblies 22 are stacked in the height direction (z direction) of the battery cell 2.

As shown in FIGS. 9 and 10, the electrode assembly 22 includes a first pole piece 221, a second pole piece 222 and a diaphragm 223 disposed between the first pole piece 221 and the second pole piece 222. The first pole piece 221 may be a positive pole piece, and the second pole piece 222 is a negative pole piece. In other embodiments, the first pole piece 221 may also be a negative pole piece, and the second pole piece 222 is a positive pole piece. The diaphragm 223 is an insulator between the first pole piece 221 and the second pole piece 222. The active material of the positive electrode sheet can be coated on the coating area of the positive electrode sheet, and the active material of the negative electrode sheet can be coated on the coating area of the negative electrode sheet. The part extending from the coating area of the positive electrode sheet is used as the positive electrode tab; the part extending from the coating area of the negative electrode sheet is used as the negative electrode tab. The positive electrode tab is connected to the positive electrode terminal on the cover plate assembly 24 through a positive adapter piece. Similarly, the negative electrode tab is connected to the negative electrode terminal on the cover plate assembly 24 through a negative electrode adapter piece.

As shown in FIG. 9, the electrode assembly 22 has a wound structure. Wherein, the first pole piece 221, the diaphragm 223 and the second pole piece 222 are all belt-shaped structures. The first pole piece 221, the diaphragm 223 and the second pole piece 222 are sequentially stacked and wound two times to form the electrode assembly 22. In addition, the electrode assembly 22 has a flat shape. When the electrode assembly 22 is manufactured, the electrode assembly 22 may be directly wound into a flat shape, or may be wound into a hollow cylindrical structure first, and then flattened into a flat shape after the winding. FIG. 9 is a schematic diagram of the outline of the electrode assembly 22. The outer surface of the electrode assembly 22 includes two flat surfaces 224, and the two flat surfaces 224 are oppositely arranged along the height direction (z direction) of the battery cell 2. The electrode assembly 22 has a substantially hexahedral structure, and the flat surface 224 is substantially parallel to the winding axis and is the outer surface with the largest area. The flat surface 224 may be a relatively flat surface, and is not required to be a pure plane.

As shown in FIG. 10, the electrode assembly 22 has a laminated structure, that is, the electrode assembly 22 includes a plurality of first pole pieces 221 and a plurality of second pole pieces 222, and the diaphragm 223 is disposed on the first pole piece 221 and the second pole piece 222. Between slices 222. The first pole piece 221 and the second pole piece 222 are stacked along the height direction (z direction) of the battery cell 2.

The electrode assembly 22 will inevitably expand in the thickness direction of the pole pieces during the charging and discharging process. The expansion amount of each pole piece is superimposed, and the accumulated expansion amount in the height direction is greater than other directions. 3 The fixed point with the box body 11 can restrict the direction of the maximum expansion of the battery cell 2 to prevent the battery pack from deforming and improve the service life of the battery pack.

As shown in FIG. 3, there is a preset gap L between the inner surface of the outer cover 4 and the outer surface of the restraining member 3. By reserving expansion space for the battery cell 2, it can prevent the deformation of the restraining member 3 from being transmitted to the outer cover 4 to force the outer lid 4 to deform; moreover, even when the battery cell 2 expands, the restraining member 3 is deformed In the case of the outer cover 4, the outer cover 4 can also further restrict the deformation of the restraining member 3 and the expansion of the battery cell 2. In some embodiments, for battery packs of different sizes, the preset gap ranges from 2 mm to 100 mm.

As shown in FIGS. 1 and 2, the battery pack may include a plurality of restraining parts 3, and each restraining part 3 covers different groups of battery cells 2 respectively. In this embodiment, a plurality of restraining components 3 are used to restrain different groups of battery cells 2 respectively, and a fixed restraint can be applied to each group of battery cells 2 independently, which reduces the coverage of restraining components 3, and can improve its own rigidity and prevent deformation. , In order to provide a stable and reliable binding force. Moreover, when a certain group of battery cells 2 has a large expansion and the corresponding restraining member 3 is deformed, the impact on other groups of battery cells 2 can be avoided, and the working reliability and service life of the battery pack can be improved.

Each restraining component 3 includes: a limiting portion 31 and two mounting portions 32. Wherein, the limiting portion 31 covers the battery cells 2 of the corresponding group; the two mounting portions 32 are connected to the two sides of the limiting portion 31 along the grouping direction of the battery cells 2 and are grouped with the corresponding battery cells 2 respectively. The fixed beams 12 on both sides of the direction are fixed. The restraining member 3 can be formed by bending a flat plate.

As shown in FIG. 2, the limiting portion 31 covers all the top surfaces of the battery cells 2 of the corresponding group, which can increase the binding force on the battery cells 2 and improve the ability of the restraining member 3 to resist deformation.

In this embodiment, by providing a plurality of independent restraining components 3, the battery cells 2 of each group can be restrained respectively. The restraints of the battery cells 2 of each group are completely independent, and the disassembly and assembly of the restraining components 3 do not affect each other. When the height of each battery cell 2 is different, it will not affect the installation of the restraint part 3. If the battery cell 2 of an individual group has a large expansion, it will only cause the corresponding restraint part 3 to be deformed. The stress is transferred to the other restraining parts 3. Moreover, when a battery cell 2 of an individual group fails and needs to be opened for maintenance and replacement, only the corresponding restraining component 3 needs to be opened, and other restraining components 3 need not be disassembled.

As shown in FIG. 3, the entire restricting portion 31 protrudes in a direction away from the battery cell 2 relative to the mounting portion 32. This structure can not only reduce the installation height of the fixed beam 12 and ensure the strength of the fixed beam 12, but also can prevent the fastener 5 from protruding from the limit part 31 when the mounting portion 32 and the fixed beam 12 are fixed by the fastener 5 The top surface can reduce the height of the battery pack.

As shown in Figures 3 and 4, a fixed beam 12 is provided between two adjacent groups of battery cells 2, and the two adjacent mounting portions 32 fixed to the fixed beam 12 each include a plurality of mounting blocks 320. The mounting blocks 320 are arranged at intervals along the extension direction of the fixed beam 12, and a plurality of mounting blocks 320 corresponding to two adjacent mounting portions 32 are alternately arranged. For example, the mounting block 320 may have a rectangular, trapezoidal or triangular structure. This structure enables the constraining members 3 corresponding to two adjacent groups of battery cells 2 to share a fixed beam 12 for fixing, which can save space and increase the energy density of the battery pack. Optionally, two fixed beams 12 may also be arranged between adjacent battery cells 2, and each restraining member 3 is fixed on a fixed beam 12 respectively.

As shown in Figure 1, in order to realize the fixing of the outer cover 4 and the box body 11, a first flange 111 is provided around the open end of the box body 11, a second flange 41 is provided around the outer cover 4, and a first flange 111 It can be fixed to the second flange 41 by bonding or fastening. In order to realize the fixation between the restraining member 3 and the fixed beam 12, a plurality of second mounting holes 321B are provided on the mounting portion 32 at intervals along the extension direction of the fixed beam 12, and the top of the fixed beam 12 is provided with a plurality of beam installations at intervals along its extension direction. In the hole 121, the fastener 5 is inserted through the second mounting hole 321B and the beam mounting hole 121 to fix the restraining component 3 and the fixed beam 12.

As shown in FIG. 5, the battery pack of the present disclosure may further include: a bead 6 arranged between the mounting portion 32 and the fixing beam 12. The bead 6 may adopt a long sheet structure, and the bead 6 is provided with holes to ensure tightness. Firmware 5 goes through. When assembling, a suitable thickness of the bead 6 can be selected to adjust the assembly gap. When the constraining component 3 and the fixed beam 12 are fixed by the fastener 5, the constraining component 3 and the battery cell 2 can maintain a proper assembly gap. It prevents the restraint component 3 from generating a relatively large pressing force on the battery cell 2 and improves the service life of the battery pack.

Optionally, the bead 6 can also be arranged between the fastener 5 and the top surface of the mounting portion 32. For example, when the fastener 5 is a screw, the bead 6 is provided between the screw head and the top surface of the mounting portion 32, so that Increase the reliability of the fixing of the fastener 5.

Still referring to FIG. 5, in order to ensure the tightness of the internal space of the battery pack and prevent external liquid or water vapor from entering the battery pack and affecting the working performance of the battery cell 2, the battery pack of the present disclosure may further include a sealing member 7 arranged on the outer cover 4 and the box Between the bodies 11, the sealing element 7 may adopt a long sheet structure or a rectangular ring structure. The seal 7 is provided with holes to ensure that the fastener passes through. The seal can be made of materials such as silicone rubber. When the battery pack is used in a vehicle, the seal can also absorb vibrations transmitted to the battery pack during the operation of the vehicle.

In order to improve the reliability of fixing the battery cell 2 and prevent the battery cell 2 from shaking, the battery pack may include at least one of a first adhesive layer, a second adhesive layer, and a third adhesive layer: the bottommost battery cell 2 is provided with a first adhesive layer between the inner bottom surface of the box body 11; a second adhesive layer is provided between the adjacent two battery cells 2 in each group of battery cells 2; A third adhesive layer is provided between the battery cells 2. For a battery pack provided with only a single layer of battery cells 2, the battery cells 2 at the bottom and the top are the same layer of battery cells 2.

6 and 7 are schematic structural diagrams of another embodiment of the battery pack of the present disclosure. The difference between the battery pack 200 and the battery pack 100 shown in FIGS. 1 to 4 is that the restraining member 3 can adopt a split structure and cover the battery Part of the surface of monomer 2.

The constraining component 3 can be divided into at least one part of the length direction and the width direction. The constraining component 3 adopts a split structure and covers at least part of the surface of the corresponding battery cell 2. As shown in FIG. 6, the restraint member 3 for covering the first battery cell 20A includes a first restraint member 3A and a second restraint member 3B. The position-limiting portion 31 of the first restraint member 3A and the second restraint member 3B can be They are arranged at intervals along the length and only cover part of the surface of the battery cell 2. The mounting portion 32 of the first restriction member 3A continuously extends in the width direction, and the mounting portion 32 of the second restriction member 3B includes a plurality of mounting blocks 320 arranged at intervals in the width direction. The restraint member 3 for covering the second battery cell 20B adopts an integral structure. FIG. 7 is a schematic diagram of fixing the first constraining component 3A and the second constraining component 3B to the fixed beam 12 by the fastener 5.

The advantage of this embodiment is that, affected by the dimensional tolerance of each battery cell 2 and the accuracy of the stacking arrangement, the top of each battery cell 2 in the same group may also have a height difference, and the split restraint member 3 is used to reduce the limit position. The processing requirements of the height dimension of the side plate of the part 31 are also easy to assemble; moreover, the split constraining component 3 can save material; in addition, by partially covering the surface of the battery cell 2, it is beneficial to the heat dissipation of the battery cell 2.

On this basis, the temperature can be adjusted according to the working requirements of the battery pack. The box assembly 1 may also include a temperature control component. The temperature control component is provided in the bottom area of the box 11, and the temperature control component is used to control the battery cell 2 Temperature adjustment is performed at the bottom. For example, in order to take away the heat generated during the operation of the battery cell 2, the battery cell 2 can be cooled; or the battery cell can be heated when the battery pack is used in a low temperature area.

The embodiments of the present disclosure cover the sides and top of each group of battery cells 2 by arranging a thermally conductive fixing beam 12 and a restraining member 3. The temperature control member is adjusted at the bottom of the box 11 while temperature can be transferred in sequence To the fixed beam 12 and the restraining component 3, the conduction path of the temperature control component regulating the temperature of the battery cell 2 is changed, the temperature distribution in the height direction in the accommodating cavity can be balanced, and the temperature difference of the battery cell 2 in the upper and lower regions is reduced, so that The temperature uniformity of each battery cell 2 is improved, so that the consistency of the depth of discharge is improved.

11-22 are schematic structural diagrams of an embodiment of the battery pack of the present disclosure. The battery pack 300 includes: a box assembly 1, a plurality of battery modules 20 and a plurality of restraining components 3.

As shown in Figures 11 and 12, the box body assembly 1 includes a box body 11 and a plurality of fixed beams 12, the box body 11 has an open end, each fixed beam 12 is fixed to the box body 11, and the box body 11 is divided into multiple For example, the fixing beam 12 can be fixed on the inner bottom surface or the side wall of the box body 11. For the specific structure of the fixed beam 12, a solid structure or a hollow structure may be adopted, for example, a weight reduction groove 122 is provided in the fixed beam 12. The cross section of the fixed beam 12 can be rectangular, trapezoidal or C-shaped, and the upper surface of the fixed beam 12 can be set as a plane to fix the constraining component on the upper surface of the fixed beam 12. Optionally, the constraining component 3 can also be fixed to the fixed beam 12. The side.

Each battery module 20 includes a plurality of battery cells 2. For example, one layer or multiple layers of battery cells 2 may be arranged in a height direction in the battery module 20. Optionally, at least two battery cells 2 may be arranged in the battery module 20 along the length and/or width direction. Each battery module 20 is correspondingly disposed in each accommodating cavity 13, and each accommodating cavity 13 is provided with a battery module 20. In some embodiments, the size of the accommodating cavity 13 is adapted to the overall external size of the corresponding battery module 20.

As shown in Figure 12, each restraining component 3 includes a limiting portion 31, a first mounting portion 32A, and a second mounting portion 32B. Each limiting portion 31 covers each battery module 20 correspondingly, and is similar to the topmost The battery cells 2 can be in contact with each other or leave a gap. The first mounting portion 32A and the second mounting portion 32B are respectively connected to the two sides of the limiting portion 31 along the arrangement direction of the plurality of fixed beams 12, and are respectively fixed to the fixed beams 12 on both sides of the corresponding battery module 20. The restraining member 3 covers the battery cell 2.

As shown in FIG. 12, for two adjacent restraint members 3, the first installation portion 32A of one restraint member 3 and the second installation portion 32B of the other restraint member 3 are fixed to the same fixed beam 12 and placed in the battery pack. The height direction of the superimposed settings.

The embodiment of the present disclosure is provided with the restraining member 3 and fixed with the fixing beam 12, when the battery module 20 expands, it can provide a stable and effective pressing force to each battery module 20, and reduce the expansion and deformation of the battery module 20 . By fixing two adjacent restraining members 3 on the same fixed beam 12, the number of fixed beams 12 can be reduced, the structure of the box assembly 1 can be simplified, and the width occupied by the fixed beams 12 in the horizontal plane can be reduced. Moreover, the first mounting portion 32A and the second mounting portion 32B fixed on the same fixed beam 12 are superimposed in the height direction, which can further reduce the width occupied by the fixed beam 12 in the horizontal plane, and only a single battery module needs to be locked. The number of fasteners required by the group 20 can satisfy the locking of the adjacent battery modules 20, which can improve the energy density and space utilization of the battery pack, and improve the assembly efficiency of the restraint member 3 and the fixed beam 12.

In addition, the two adjacent battery modules 20 are separated by the fixed beam 12, when some battery modules 20 work to generate a large amount of heat and thermal runaway occurs, the heat diffusion to other battery modules 20 can be delayed, and the battery can be improved. Security of package work.

In some embodiments, the extension widths of the first mounting portion 32A and the second mounting portion 32B protruding from the limiting portion 31 are the same, so that the first mounting portion 32A and the second mounting portion 32B are substantially completely overlapped, which can further reduce fixing The width occupied by the beam 12 in the horizontal plane, thereby improving the energy density and space utilization of the battery pack.

In some embodiments, as shown in FIG. 13 and FIG. 14, the limiting portion 31 of each restraining member 3 protrudes in a direction away from the battery module 20 as a whole relative to the first mounting portion 32A and the second mounting portion 32B. There is a first distance L1 between the bottom surface of a mounting portion 32A and the top surface of the limiting portion 31, and there is a second distance L2 between the bottom surface of the second mounting portion 32B and the top surface of the limiting portion 31; wherein, the first distance L1 is greater than the second distance L2. When two adjacent restraining members 3 are fixed to the same fixed beam 12, the first mounting portion 32A is located at the bottom of the second mounting portion 32B.

In this embodiment, by setting a height difference between the first mounting portion 32A and the second mounting portion 32B of the restraining member 3, when two adjacent restraining members 3 are installed on the same fixed beam 12, one of the restraining members 3 The first mounting portion 32A and the second mounting portion 32B of the other restraining member 3 are stacked in the height direction. Moreover, the structure of each restraining component 3 in the battery pack is the same, and the same assembly direction is adopted, which can reduce the types of parts and reduce the assembly difficulty.

In some embodiments, as shown in FIG. 13, the thickness of the first mounting portion 32A is t, which satisfies L1-L2≥t.

If L1-L2=t, the first mounting portion 32A and the second mounting portion 32B of the two adjacent restraining components 3 are in direct contact, and there is no need to use an adjusting gasket, which can simplify the assembly process.

If L1-L2>t, there is a gap between the first mounting portion 32A and the second mounting portion 32B of the two adjacent restraining members 3, and it needs to be between the first mounting portion 32A and the second mounting portion 32B according to the size of the gap An adjustment washer is provided to make the first mounting portion 32A and the second mounting portion 32B reliably contact, and to improve the firmness of the fixing of the restraining members 3 and the fixed beam 12.

As shown in Figures 11 and 15, seven fixed beams 12 are provided at intervals along the length direction (x direction) in the box body 11, and a containing cavity 13 is formed between two adjacent fixed beams 12, and each containing cavity 13 A battery module 20 is provided inside, and a total of six battery modules 20 are provided in the box 11. Each battery module 20 is provided with two layers of battery cells 2 along the height direction, and each layer of battery cells 2 includes a plurality of battery cells 2 arranged in the width direction (y-direction). The seat portion 31 covers the topmost battery cell 2 in the corresponding battery module 20. Alternatively, the fixed beam 12 may also be arranged along the width direction of the box 11.

In order to more clearly reflect the installation relationship of the restraining components 3, as shown in FIG. 16, the installation of three adjacent restraining components 3 is taken as an example for description, and the installation forms of the remaining restraining components 3 can be deduced by analogy.

The three adjacent constraining components 3 are respectively the first constraining component 3A, the second constraining component 3B and the third constraining component 3C. The first constraining component 3A, the second constraining component 3B and the third constraining component 3C are along a plurality of fixed beams. The 12 arrangement directions are set in sequence. Among them, as shown in FIG. 16, the first mounting portion 32A of the first restricting member 3A is located below the second mounting portion 32B of the second restricting member 3B, and the first mounting portion 32A of the second restricting member 3B is located at the third restricting member Below the second mounting part 32B of 3C.

In order to fix the first mounting portion 32A, the second mounting portion 32B and the fixing beam 12, as shown in FIGS. 12 and 14, the battery pack of the present disclosure may further include a plurality of fasteners 5, and the first mounting portion 32A is fixed along the The beam 12 is provided with a plurality of first mounting holes 321A at intervals in the longitudinal direction; the second mounting part 32B superimposed on the first mounting part 32A in the height direction is provided with a plurality of second mounting holes at intervals along the length direction of the fixed beam 12 321B; A plurality of beam mounting holes 121 are provided on the fixed beam 12 at intervals along its length. Each fastener 5 passes through the second mounting hole 321B, the first mounting hole 321A and the beam mounting hole 121 in the corresponding position in order to be fixed to the corresponding fixed beam 12. For example, the fastener 5 can be a screw or a bolt, the first mounting hole 321A and the second mounting hole 321B are smooth holes, and the beam mounting hole 121 is a threaded hole.

For the embodiment in which the first mounting portion 32A is located below the second mounting portion 32B, the diameter of the second mounting hole 321B on the second mounting portion 32B is smaller than the diameter of the first mounting hole 321A on the first mounting portion 32A.

The first mounting hole 321A with a larger diameter is provided on the first mounting portion 32A, which can reduce the influence of the component processing tolerances of the constraining component 3 and the fixed beam 12 during assembly, and facilitate the installation of the fastener 5. At the same time, the second mounting hole 321B with a smaller diameter is opened on the second mounting portion 32B, which can increase the contact area of the fastener 5 such as bolts and the second mounting hole 321B of the second mounting portion 32B, thereby increasing the fastener 5 and the second mounting portion 32B, thereby improving the firmness of the two adjacent restraining members 3 and the fixed beam 12 fixed.

In another fixed structure, if the weight-reducing groove 122 provided on the fixed beam 12 makes the material at the beam mounting hole 121 thinner, the beam mounting hole 121 can be set as a light hole, and the pressure is embedded in the beam mounting hole 121 The rivet nut is a circular arc structure with a boss at one end, and the boss is in contact with the top of the fixed beam 12. In order to enable the first mounting portion 32A to reliably contact the fixed beam 12, the opening diameter of the first mounting hole 321A can be made larger than the outer diameter of the boss of the rivet nut, so as to avoid the boss and increase the first mounting portion 32A The contact area with the fixed beam 12 is uniform in force to avoid local stress concentration.

As shown in Figures 18 to 21, the restricting portion 31 is provided with reinforcing ribs 33, which can increase the structural strength of the restricting member 3, so as to provide a more stable and effective pressing force for each battery module 20, and reduce the occurrence of the battery module 20. The degree of expansion and deformation.

As shown in FIG. 18 and FIG. 19, the reinforcing rib 33 includes a plurality of ribs arranged at intervals. The ribs can be formed by stamping, which is convenient for processing and does not increase the weight of the restraining component 3. Each rib protrudes in a direction away from the battery module 20. This structure can maintain a larger contact area between the restraining member 3 and the battery module 20, and can provide a larger pressing force for the battery module 20 .

In some embodiments, the ribs and the fixing beams 12 extend in the same direction, which can form a balanced pressing force on the battery cells 2 on the top layer of the corresponding battery module 20. Optionally, the extending direction of the ribs can also be perpendicular to the extending direction of the fixed beam 12, or the ribs can also be arranged obliquely.

As shown in FIGS. 20 and 21, the difference from FIGS. 18 and 19 is that each rib protrudes toward the direction close to the battery module 20. This structure can be used to align the battery module 20 with the rib 33 Provide pressing force. In addition, the ribs shown in Figure 18 and Figure 20 can also be combined

Alternatively, the reinforcing rib 33 may also be a convex part and/or a concave part provided on at least one side surface of the limiting part 31, and the convex part and/or the concave part may be formed by machining. For example, when a convex part or a concave part is provided on one of the side surfaces of the limiting part 31, the back surface can be kept flat. In addition, the rib 33 may also be a boss or a convex point formed by stamping on the limiting portion 31.

As shown in FIG. 22, the constraining component 3 has a split structure and covers at least part of the surface of the corresponding battery module 20. For example, the constraining component 3 may be separately arranged along the length direction and/or the width direction.

The difference between FIG. 22 and FIG. 15 is that the restriction member 3 covering the single battery module 20 is divided into a first split restriction portion 3F and a second split restriction portion 3G, wherein the first split restriction portion 3F and the second split restriction portion 3F The restricting portions 31 of the split restricting portion 3G can be arranged at intervals along the arrangement direction of the plurality of fixed beams 12 to cover only part of the surface of the battery module 20. The first split constraining portion 3F and the second split constraining portion 3G extend continuously in the width direction.

The advantage of this embodiment is that, affected by the dimensional tolerance of each battery cell 2 in the battery module 20 and the accuracy of the stacking arrangement, the top of each battery cell 2 in the same battery module 20 may also have a height difference, and a split type is adopted. The constraining component 3 reduces the processing requirements for the height dimension of the constraining portion 31 and is easy to assemble; moreover, the split constraining component 3 can save materials; in addition, by partially covering the surface of the battery module 20, it is beneficial to the heat dissipation of the battery module 20 .

As shown in FIG. 11, the battery pack of the present disclosure may further include an outer cover 4, which is provided on the side of the restraining member 3 away from the battery module 20 and closes the open end of the box body 11. The sealing here refers to the sealing connection between the outer cover 4 and the box body 11, which can prevent external liquid and water vapor from entering the battery pack and improve the safety performance of the battery pack.

As shown in Figure 11, in order to realize the fixation of the outer cover 4 and the box body 11, a first flange 111 is provided around the open end of the box body 11, a second flange 41 is provided around the outer cover 4, and a first flange 111 It can be fixed to the second flange 41 by bonding or fastening.

The battery pack of the foregoing embodiment covers different battery modules 20 through a plurality of restraining members 3, and is fixed to the corresponding fixed beam 12, which is equivalent to adding a fixed point between the restraining member 3 and the box 11, thereby reducing The span between the fixed points is reduced, which can improve the deformation resistance of the constraining component 3. When the battery cell expands, the restraining member 3 is not easily deformed, which can further provide a stable pressing force to the battery module 20, prevent the size of the battery pack from increasing in the height direction, and is not easy to be squeezed due to the deformation of the restraining member 3 The outer cover 4 can increase the service life of the battery pack.

As shown in FIG. 11, there is a preset gap L between the inner surface of the outer cover 4 and the outer surface of the restricting member 3. By reserving an expansion space for the battery module 20, it is possible to prevent the deformation of the restraining member 3 from being transmitted to the outer cover 4 to force the outer lid 4 to deform; moreover, even if the battery module 20 swells, the restraining member 3 is deformed. In the case of the outer cover 4, the outer cover 4 can also further restrict the deformation of the restraining member 3 and the expansion of the battery module 20. In some embodiments, for battery packs of different sizes, the preset gap ranges from 2 mm to 100 mm.

In order to improve the reliability of fixing the battery cell 2 and prevent the battery cell 2 from shaking, the battery pack includes at least one of a first adhesive layer, a second adhesive layer, and a third adhesive layer: the bottom surface of each battery module 20 A first adhesive layer is provided between the inner bottom surface of the box body 11; a second adhesive layer is provided between two adjacent battery cells 2 in the battery module 20; the top of each battery module 20 is A third adhesive layer is provided between the constraining members 3.

As shown in FIG. 11, the battery pack of the present disclosure may further include: a bead 6, the first mounting portion 32A and the second mounting portion 32B are located between the bead 6 and the fixed beam 12, the bead 6 may adopt a long sheet structure, and the bead 6 is provided with holes to ensure that the fastener 5 passes through.

Still referring to FIG. 11, in order to ensure the tightness of the internal space of the battery pack and prevent external liquid or water vapor from entering the battery pack and affecting the working performance of the battery cell 2, the battery pack of the present disclosure may further include a sealing member 7 arranged on the outer cover 4 and the box Between the bodies 11, the sealing element 7 may adopt a long sheet structure or a rectangular ring structure. The seal 7 is provided with holes to ensure that the fastener passes through. The seal can be made of materials such as silicone rubber. When the battery pack is used in a vehicle, the seal can also absorb vibrations transmitted to the battery pack during the operation of the vehicle.

FIG. 23 is a schematic structural diagram of another embodiment of the battery pack of the present disclosure. In the battery pack 400, the limiting portion 31 as a whole protrudes away from the battery module 20 with respect to the first mounting portion 32A and the second mounting portion 32B , The two adjacent constraining components 3 are the fourth constraining component 3D and the fifth constraining component 3E, respectively.

In the fourth restricting member 3D, there is a first distance L1 between the bottom surface of the first mounting portion 32A and the top surface of the limiting portion 31, and there is a first distance between the bottom surface of the second mounting portion 32B and the top surface of the limiting portion 31. One distance L1. In the fifth restricting member 3E, there is a second distance L2 between the bottom surface of the first mounting portion 32A and the top surface of the limiting portion 31, and there is a second distance L2 between the bottom surface of the second mounting portion 32B and the top surface of the limiting portion 31. Two distance L2.

Wherein, the fourth constraining component 3D and the fifth constraining component 3E are alternately arranged along the arrangement direction of the plurality of fixed beams 12, and the first distance L1 is greater than the second distance L2.

The four adjacent constraining members 3 are respectively provided with a fourth constraining component 3D, a fifth constraining component 3E, a fourth constraining component 3D and a fifth constraining component 3E in sequence along the arrangement direction of the plurality of fixed beams 12. As shown in FIG. 23, from the left, the first mounting portion 32A of the first fifth restricting member 3E is located above the second mounting portion 32B of the fourth restricting member 3D on the left; the first fifth restricting member 3E is The second mounting portion 32B is located above the first mounting portion 32A of the fourth restriction member 3D on the right; the first mounting portion 32A of the next fifth restriction member 3E is located above the second mounting portion 32B of the fourth restriction member 3D on the right , And so on.

In the height direction, the first mounting portion 32A and the second mounting portion 32B of each fifth restricting member 3E are superimposed on the first mounting portion 32A and the second mounting portion 32B of the fourth restricting member 3D adjacent to both sides.

Although the embodiment is provided with two sizes of constraining parts 3, during assembly, neither the fourth constraining part 3D nor the fifth constraining part 3E has a direction requirement, which can reduce assembly difficulty and improve assembly efficiency. Moreover, when the battery module 20 covered by the fifth restraining component 3E fails, the battery module 20 can be replaced or repaired only by removing the corresponding fifth restraining component 3E; the fourth restraining component 3D covers When the battery module 20 fails, the fifth restraint member 3E adjacent to both sides of the fourth restraint member 3D is removed, and the battery module 20 can be replaced or repaired. Therefore, the battery module in the battery pack can be improved. 20 Convenience and efficiency of maintenance.

FIG. 24 shows a schematic diagram of the overall structure of a battery pack according to an embodiment of the present disclosure. The battery pack 500 includes: a box assembly 1, a plurality of battery modules 20, a plurality of restraining members 3, and a plurality of first fasteners 5A And a plurality of second fasteners 5B.

As shown in Figures 24 and 25, the box body assembly 1 includes a box body 11 and a plurality of fixed beams 12, the box body 11 has an open end, each fixed beam 12 is fixed to the box body 11, and the box body 11 is divided into multiple For example, the fixing beam 12 can be fixed on the inner bottom surface or the side wall of the box body 11. In order to reduce the weight of the box assembly 1, the fixed beam 12 may adopt a hollow structure. Optionally, as shown in FIG. 25, the fixed beam 12 is formed by bending a sheet metal structure; or, as shown in FIG. 34, the fixed beam 12 A weight reduction groove 122 is provided inside. The section of the fixed beam 12 can be rectangular, trapezoidal or C-shaped, and the upper surface of the fixed beam 12 can be set to be flat to fix the constraining component 3 on the upper surface of the fixed beam 12. Optionally, the constraining component 3 can also be fixed to the fixed beam. 12 on the side.

As shown in FIG. 24, the battery pack may further include an outer cover 4 which is provided on the side of the restraining member 3 away from the battery module 20 and closes the open end of the box body 11. The sealing here refers to the sealing connection between the outer cover 4 and the box body 11, which can prevent external liquid and water vapor from entering the battery pack and improve the safety performance of the battery pack.

As shown in FIGS. 24 and 34, each battery module 20 includes a plurality of battery cells 2. For example, the battery module 20 may be provided with one layer along the height direction or multiple layers of battery cells 2 may be stacked. Optionally, at least two battery cells 2 may be arranged in the battery module 20 along the length and/or width direction. Each battery module 20 is correspondingly disposed in each accommodating cavity 13, and each accommodating cavity 13 is provided with a battery module 20. In some embodiments, the size of the accommodating cavity 13 is adapted to the overall external size of the corresponding battery module 20.

In order to improve the reliability of fixing the battery cell 2 and prevent the battery cell 2 from shaking, the battery pack includes at least one of a first adhesive layer, a second adhesive layer, and a third adhesive layer: each battery module 20 An adhesive layer is provided between the bottom surface and the inner bottom surface of the box body 11; an adhesive layer is provided between two adjacent battery cells 2 in the battery module 20; the top of each battery module 20 is between the restraining member 3 There is an adhesive layer between.

As shown in Figures 25-27, each restraining component 3 includes a limiting portion 31, a first mounting portion 32A, and a second mounting portion 32B. Each limiting portion 31 covers each battery module 20 correspondingly, and The battery cells 2 on the top layer may be in contact or have gaps between them. The first mounting portion 32A and the second mounting portion 32B are respectively connected to the two sides of the limiting portion 31 along the arrangement direction of the plurality of fixed beams 12, and are respectively fixed to the fixed beams 12 on both sides of the corresponding battery module 20. The restraining member 3 covers the battery cell 2.

The first installation portion 32A is provided with a plurality of first installation holes 321A at intervals along the length direction of the fixed beam 12, and the second installation portion 32B is provided with a plurality of second installation holes 321B at intervals along the length direction of the fixed beam 12. Each first fastener 5A passes through the corresponding first mounting hole 321A and is fixed to the fixing beam 12 corresponding to the first mounting portion 32A, and each second fastener 5B passes through the corresponding second mounting hole 321B and It is fixed to the fixed beam 12 corresponding to the second mounting portion 32B. Wherein, the adjustment amounts of the first mounting hole 321A and the second mounting hole 321B in the arrangement direction of the plurality of fixed beams 12 are different, so as to accommodate the matching error caused by processing and assembly. For example, the first fastener 5A and the second fastener 5B may be screws, bolts, rivets, or the like.

The battery pack of the embodiment of the present disclosure is fixed by setting the restraining member 3 and the fixing beam 12, when the battery module 20 expands, it can provide a stable and effective pressing force to each battery module 20 and reduce the expansion of the battery module 20 The degree of deformation.

Moreover, the first mounting hole 321A and the second mounting hole 321B on both sides of the restraining member 3 are set to different adjustment amounts. When the restraining member 3 is installed on the fixed beam 12, the problem of the restraining member 3 and the fixed beam 12 can be solved. The fitting error between the two leads to the problem of difficult assembly, thereby improving the assembly efficiency of the battery pack, and reducing the requirements on the machining accuracy of the parts to reduce the production cost. In addition, it can also release the connection stress between the fastener and the mounting hole. Prevent the battery pack from deforming due to assembly stress.

In some embodiments, as shown in FIGS. 25-27, the first mounting hole 321A is a round hole, and the second mounting hole 321B is provided with an opening 323 on the side wall away from the limiting portion 31, and the opening 323 is installed in the second mounting hole. The portion 32B penetrates in the thickness direction, and the size of the opening 323 in the length direction of the fixed beam 12 is not less than the diameter of the first connecting section 51B of the second fastener 5B, so that the second fastener 5B has a fitting error. The first connecting section 51B can move along the arrangement direction (y-direction) of the plurality of fixed beams 12 in the opening 323, thereby releasing the assembly stress. For example, the second mounting hole 321B includes a semicircular hole and a linear extension section respectively tangent to two opening ends of the semicircle hole, and the two linear extension sections form an opening 323.

This structure can maximize the adjustment amount of the restraining member 3 during assembly when the width of the second mounting portion 32B along the arrangement direction of the plurality of fixed beams 12 is constant, and can tolerate greater matching errors; The mounting hole 321B is easier to process.

As shown in FIG. 29, the distance between the side wall of the second mounting hole 321B closest to the limiting portion 31 and the side surface of the second mounting portion 32B away from the limiting portion 31 is L3. In some embodiments, the distance L3 is greater than the diameter of the first connecting section 51B of the second fastener 5B. In this way, when the first connecting section 51B moves between the two linear extension sections of the second mounting hole 321B due to the fitting error, the top of the first limiting section 52B of the second fastener 5B and the second mounting portion 32B can be made Keep the contact area as much as possible on the surface, and increase the pressing force to improve the connection strength between the restraining component 3 and the fixed beam 12.

Preferably, the diameter of the first mounting hole 321A and the diameter of the arc section of the second mounting hole 321B are the same. Therefore, the first fastener 5A and the second fastener 5B can adopt the same diameter size, which can increase The assembly is efficient, and the force on both sides of the restraint member 3 and the fixed beam 12 are even when fixed. Optionally, the diameter of the first mounting hole 321A and the arc section of the second mounting hole 321B can also adopt different diameters.

Preferably, as shown in FIG. 28, the first mounting holes 321A have the same spacing along the extension direction of the fixed beam 12, and the second mounting holes 321B have the same spacing along the extension direction of the fixed beam 12, so that the constraining member 3 and the fixed beam 12 When fixing, the force is uniform everywhere, so that the restraining part 3 can be reliably fixed. Optionally, the distance between the first mounting holes 321A along the extending direction of the fixed beam 12 may also be different, and the distance between the second mounting holes 321B along the extending direction of the fixed beam 12 may also be different.

In some fixing methods, referring to FIG. 26, a plurality of beam mounting holes 121 are provided on the fixed beam 12 at intervals along its own length direction, and the beam mounting holes 121 are threaded holes. Each first fastener 5A passes through the first mounting hole 321A and the beam mounting hole 121 respectively and is fixed to the fixed beam 12 corresponding to the first mounting portion 32A, or each second fastener 5B passes through the second mounting hole in sequence. The hole 321B and the beam installation hole 121 are fixed to the corresponding fixed beam 12. Such a beam mounting hole 121 is easy to process, and because the threaded hole is directly provided on the fixed beam 12, the connection strength between the restraining component 3 and the fixed beam 12 can be improved, so as to provide more effective restraint on the battery module 20.

In other fixing methods, as shown in FIG. 26, the fixed beam 12 is formed by bending a sheet metal structure, or as shown in FIG. 34, a weight reduction groove 122 is provided on the fixed beam 12, so that the top of the fixed beam 12 is thin. The wall structure makes it difficult to open threaded holes directly.

To this end, as shown in FIGS. 28 and 29, a plurality of beam mounting holes 121 are provided on the fixed beam 12 at intervals along its length direction, and the beam mounting holes 121 are light holes. The battery pack also includes a plurality of blind rivet nuts 5C, as shown in FIGS. 31 and 32. The blind rivet nut 5C includes a second connecting section 51C and a second limiting section 52C. The second connecting section 51C of each blind rivet nut 5C corresponds to each other. Each beam mounting hole 121 is embedded and connected with the beam mounting hole 121, the bottom of the second limiting section 52C is in contact with the top of the fixed beam 12, and the outer periphery of the second limiting section 52C may be circular or hexagonal.

Each first fastener 5A passes through the first mounting hole 321A and the inner hole of the blind rivet nut 5C respectively and is fixed to the corresponding fixed beam 12, or each second fastener 5B passes through the second mounting hole 321B and The inner hole of the blind rivet nut 5C is fixed to the corresponding fixing beam 12.

When the fixed beam 12 adopts a thin-walled structure, the length of the threaded hole can be increased by arranging the rivet nut 5C on the fixed beam 12, which can reduce the weight of the box assembly 1 and securely fix the bundle member 3 On the fixed beam 12.

As shown in FIG. 29, the diameter of the first mounting hole 321A and the diameter of the circular arc section of the second mounting hole 321B are both larger than the outer dimension of the second limiting section 52C. Therefore, when the restraint member 3 is mounted on the fixed beam 12, the first mounting hole 321A and the second mounting hole 321B can avoid the second limit section 52C, so that the first mounting portion 32A and the second mounting portion 32B All are in full contact with the top surface of the fixed beam 12, and the force is more uniform.

In other embodiments, as shown in FIG. 33, the first mounting hole 321A is a round hole, and the second mounting hole 321B is an elongated round hole extending along the arrangement direction of the plurality of fixed beams 12. Affected by the matching size of the parts, the first connecting section 51B of the second fastener 5B can be located at any position of the oblong hole along the extending direction.

This structure can ensure the adjustment of the constraining component 3 when assembling to allow the processing and assembly errors to restrict the second fastener 5B from coming out of the second mounting hole 321B, and ensure that the second fastener 5B and the constraining component 3 and The strength of the fixed beam 12. Moreover, since the side surfaces of the second mounting portion 32B away from the limiting portion 31 are closed along the entire extension direction of the fixed beam 12, the overall strength of the restraining member 3 can be improved, and the restraining member 3 can be prevented from being deformed.

After describing the connection mode of the single restraint member 3 and the fixed beam 12, since a plurality of battery modules 20 are generally provided in the battery pack, a plurality of restraint members 3 are also provided accordingly.

In one structural form, the width of the fixed beam 12 is not less than the width of the sum of the two first mounting portions 32A, the two second mounting portions 32B, or the first mounting portion 32A and the second mounting portion 32B, so as to restrict each The components 3 are independently mounted on the corresponding fixed beams 12 respectively.

In another structural form, as shown in Figures 34 to 38, for two adjacent restraint members 3, the first installation portion 32A of one restraint member 3 and the second installation portion 32B of the other restraint member 3 pass through the same group The first fastener 5A or the second fastener 5B is fixed to the same fixed beam 12, and superimposed in the height direction (z direction).

In this structure, the first fastener 5A passes through the first installation hole 321A and the second installation hole 321B at the same time, and the second fastener 5B also passes through the first installation hole 321A and the second installation hole 321B at the same time. In 34, 37 to 38, the first fastener 5A and the second fastener 5B will no longer be distinguished, and they will be collectively marked as the first fastener 5A.

By fixing two adjacent restraining members 3 on the same fixed beam 12, the number of fixed beams 12 can be reduced, the structure of the box assembly 1 can be simplified, and the width occupied by the fixed beams 12 in the horizontal plane can be reduced. Moreover, the first mounting portion 32A and the second mounting portion 32B fixed on the same fixed beam 12 are superimposed in the height direction, which can further reduce the width occupied by the fixed beam 12 in the horizontal plane, and only need to lock a single The number of fasteners required by the battery module 20 can satisfy the locking of the adjacent battery modules 20, which can improve the energy density and space utilization of the battery pack, and improve the assembly efficiency of the restraining member 3 and the fixing beam 12.

Moreover, since the first mounting hole 321A and the second mounting hole 321B have different adjustment amounts, when the first mounting portion 31A and the second mounting portion 32B of the two adjacent restraining members 3 are stacked in the height direction, it can be Make the first fastener 5A smoothly pass through the first mounting hole 321A and the second mounting hole 321B at the same time, which can reduce the influence of the part processing tolerances of the constraining component 3 and the fixed beam 12 during assembly, and it is easy to install the first fastener 5A.

As shown in FIG. 34, the first mounting portion 32A is located above the second mounting portion 32B that is superimposed on the first mounting portion 32A in the height direction. Since the first mounting portion 32A is provided with a circular hole, the first mounting portion 32A is placed above, so that the first limiting section of the first fastener 5A can be aligned with the top surface of the first mounting portion 32A in the entire circumferential direction. Adequate contact makes the force more uniform, and improves the reliability of the connection between the restraint member 3 and the fixed beam 12, thereby improving the firmness of the connection between the two adjacent restraint members 3 and the fixed beam 12. Optionally, the first mounting portion 32A may also be located below the second mounting portion 32B superimposed on the first mounting portion 32A in the height direction.

There are at least the following two implementation structures for fixing two adjacent restraint members 3 on the same fixed beam 12.

In one structure, as shown in FIG. 35, there is a first distance L1 between the bottom surface of the first mounting portion 32A and the top surface of the limiting portion 31, and the bottom surface of the second mounting portion 32B and the top surface of the limiting portion 31 There is a second distance L2 between them; wherein, the second distance L2 is greater than the first distance L1. When two adjacent restraining members 3 are fixed on the same fixed beam 12, the second mounting portion 32B is located at the bottom of the first mounting portion 32A.

In this embodiment, by setting a height difference between the first mounting portion 32A and the second mounting portion 32B of the restraining member 3, when two adjacent restraining members 3 are installed on the same fixed beam 12, one of the restraining members 3 The first mounting portion 32A and the second mounting portion 32B of the other restraining member 3 are stacked in the height direction. Moreover, the structure of the restraining parts 3 in the battery pack is the same, and the same assembly direction is adopted, which can reduce the types of parts and reduce the assembly difficulty.

In some embodiments, as shown in FIG. 35, the thickness of the second mounting portion 32B is t, which satisfies L2-L1≥t.

If L2-L1>t, there is a gap between the first mounting portion 32A and the second mounting portion 32B of the two adjacent restraining members 3, and it needs to be between the first mounting portion 32A and the second mounting portion 32B according to the size of the gap An adjustment washer is provided to make the first mounting portion 32A and the second mounting portion 32B reliably contact, and to improve the firmness of the fixing of the restraining members 3 and the fixed beam 12.

As shown in Figure 24, the box body 11 is provided with seven fixed beams 12 at intervals along the length direction (x-direction), and a containing cavity 13 is formed between two adjacent fixed beams 12, and each containing cavity 13 is provided with A battery module 20 is provided with six battery modules 20 in the box 11. Each battery module 20 is provided with two layers of battery cells 2 along the height direction, and each layer of battery cells 2 includes a plurality of battery cells 2 arranged in the width direction (y-direction). The seat portion 31 covers the topmost battery cell 2 in the corresponding battery module 20. Alternatively, the fixed beam 12 may also be arranged along the width direction of the box 11.

In order to more clearly reflect the installation relationship of each restraining component 3, as shown in FIG. 36, the installation of three adjacent restraining components 3 is taken as an example for description, and the installation forms of the remaining restraining components 3 can be deduced by analogy.

, The three adjacent constraining parts 3 in the battery pack 500 are the first constraining part 3A, the second constraining part 3B and the third constraining part 3C, the first constraining part 3A, the second constraining part 3B and the third constraining part 3C They are arranged in sequence along the arrangement direction of the plurality of fixed beams 12. Among them, as shown in FIG. 36, the second mounting portion 32B of the first restricting member 3A is located below the first mounting portion 32A of the second restricting member 3B, and the second mounting portion 32B of the second restricting member 3B is located at the third restricting member Below the first mounting portion 32A of 3C. In this type of battery pack 500, each of the first mounting portions 32A can be positioned above the second mounting portion 32B that is superimposed on the first mounting portion 32A in the height direction.

In another structure, as shown in FIG. 38, in the battery pack 600, two adjacent restraining members 3 are the fourth restraining member 3D and the fifth restraining member 3E, respectively. In the fourth restricting member 3D, there is a first distance L1 between the bottom surface of the first mounting portion 32A and the top surface of the limiting portion 31, and there is a first distance between the bottom surface of the second mounting portion 32B and the top surface of the limiting portion 31. One distance L1. In the fifth restricting member 3E, there is a second distance L2 between the bottom surface of the first mounting portion 32A and the top surface of the limiting portion 31, and there is a second distance L2 between the bottom surface of the second mounting portion 32B and the top surface of the limiting portion 31. Two distance L2.

The four adjacent constraining members 3 are respectively provided with a fourth constraining component 3D, a fifth constraining component 3E, a fourth constraining component 3D and a fifth constraining component 3E in sequence along the arrangement direction of the plurality of fixed beams 12. As shown in FIG. 38, from the left, the first mounting portion 32A of the first fifth restricting member 3E is located above the second mounting portion 32B of the fourth restricting member 3D on the left; the first fifth restricting member 3E is The second mounting portion 32B is located above the first mounting portion 32A of the fourth restriction member 3D on the right; the first mounting portion 32A of the next fifth restriction member 3E is located above the second mounting portion 32B of the fourth restriction member 3D on the left , And so on.

Although this embodiment is provided with two sizes of constraining parts 3, during assembly, neither the fourth constraining part 3D nor the fifth constraining part 3E has a direction requirement, which can reduce assembly difficulty and improve assembly efficiency. Moreover, when the battery module 20 covered by the fifth restraining component 3E fails, the battery module 20 can be replaced or repaired only by removing the corresponding fifth restraining component 3E; the fourth restraining component 3D covers When the battery module 20 fails, the fifth restraint member 3E adjacent to both sides of the fourth restraint member 3D is removed, and the battery module 20 can be replaced or repaired. Therefore, the battery module in the battery pack can be improved. 20 Convenience and efficiency of maintenance.

For the structure of the battery cell 2 in the foregoing embodiments, reference may be made to FIGS. 8 to 10 and the previous related descriptions about the battery cell 2.

The battery pack and the vehicle provided by the present disclosure are described in detail above. Specific examples are used in this article to describe the principles and implementations of the present disclosure. The description of the above examples is only used to help understand the methods and core ideas of the present disclosure. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present disclosure, several improvements and modifications can be made to the present disclosure, and these improvements and modifications also fall within the protection scope of the claims of the present disclosure.

Claims

A battery pack, including:

The box assembly (1) includes a box (11) and a fixed beam (12), the fixed beam (12) is fixed in the box (11);

The battery cell (2) is arranged in the box (11); and

The restraining component (3) covers the battery cell (2) and is fixed to the fixed beam (12).
The battery pack according to claim 1, further comprising an outer cover (4), the outer cover (4) is arranged on the side of the restraining member (3) away from the box body (11), and the The open end of the box body (11) is closed.
The battery pack according to claim 1 or 2, wherein the fixed beam (12) divides the box body (11) into a plurality of accommodating cavities (13), and the battery pack includes a plurality of the batteries Single cell (2), and the plurality of battery cells (2) are divided into multiple groups in a plane perpendicular to the height direction, and each group of battery cells (2) has at least two battery cells (2) and are respectively arranged in different said accommodating cavities (13).
The battery pack according to claim 3, wherein the battery pack includes a plurality of the fixing beams (12), and the fixing beams are provided on both sides of each group of the battery cells (2) along the grouping direction (12).
The battery pack according to claim 3, wherein:

The plurality of battery cells (2) are grouped along the length direction of the battery pack, and the fixing beam (12) extends along the width direction of the battery pack; and/or

The plurality of battery cells (2) are grouped along the width direction of the battery pack, and the fixing beam (12) extends along the length direction of the battery pack.
The battery pack according to any one of claims 3 to 5, comprising a plurality of the restraining members (3), and each of the restraining members (3) respectively covers different groups of the battery cells (2).
The battery pack according to any one of claims 3 to 6, wherein the restraining member (3) comprises:

The limit part (31) covers the battery cells (2) of the corresponding group; and

Two mounting parts (32) are respectively connected to both sides of the limiting part (31) along the grouping direction of the battery cells (2), and the two mounting parts (32) are respectively connected to the corresponding groups of the The fixing beams (12) on both sides of the battery cell (2) are fixed.
The battery pack according to claim 7, wherein the entire limit portion (31) protrudes away from the battery cell (2) relative to the mounting portion (32).
The battery pack according to any one of claims 1 to 8, wherein the restraining member (3) has a split structure and covers at least part of the surface of the corresponding battery cell (2).
The battery pack according to any one of claims 2-9, wherein there is a preset gap (L) between the inner surface of the outer cover (4) and the outer surface of the restraining member (3), preferably , The range of the preset gap (L) is 2mm-100mm.
The battery pack according to any one of claims 3-10, comprising at least one of the following:

The first adhesive layer is provided between the battery cell (2) at the bottom layer and the inner bottom surface of the box body (11);

The second adhesive layer is provided between two adjacent battery cells (2) in each group of battery cells (2); and

The third adhesive layer is arranged between the restraining member (3) and the topmost battery cell (2).
The battery pack according to any one of claims 1 to 11, wherein the battery cell (2) comprises:

Housing (21); and

The electrode assembly (22) arranged in the housing (21), the electrode assembly (22) includes a first pole piece (221), a second pole piece (222), and a first pole piece ( 221) and the diaphragm (223) between the second pole piece (222);

Wherein, the electrode assembly (22) has a winding structure and is flat, and the outer surface of the electrode assembly (22) includes two flat surfaces (224), and the two flat surfaces (224) extend along the The height direction is relatively set; or,

The electrode assembly (22) has a laminated structure, and the first pole piece (221) and the second pole piece (222) are stacked in the height direction.
The battery pack according to claim 7 or 8, further comprising:

The pressure strip (6) and the fastener (5), the mounting portion (32) is arranged between the pressure strip (6) and the fixed beam (12), and the fastener (5) passes through the The bead (6) and the mounting part (32) are fixed to the fixed beam (12) to fix the mounting part (32) on the fixed beam (12).
The battery pack according to any one of claims 2 to 12, further comprising a sealing member (7), the sealing member (7) is provided between the outer cover (4) and the box body (11) So that the open end of the box (11) is closed.
The battery pack according to claim 7 or 8, wherein a fixed beam (12) and a fixed beam (12) are provided between the battery cells (2) of two adjacent groups. Each of the two fixed adjacent installation parts (32) includes a plurality of installation blocks (320), and the plurality of installation blocks (320) are arranged at intervals along the extension direction of the fixed beam (12), and the phase The multiple mounting blocks (320) corresponding to the two adjacent mounting parts (32) are alternately arranged.
The battery pack according to any one of claims 1 to 14, wherein:

The box assembly (1) includes a plurality of the fixed beams (12), each of the fixed beams (12) is fixed to the box (11), and the box (11) is divided into multiple A containing cavity (13);

The battery pack includes a plurality of battery modules (20), each of the battery modules (20) includes a plurality of the battery cells (2), and each of the battery modules (20) is correspondingly arranged at In each of the accommodating cavities (13); and

The battery pack includes a plurality of the restraining components (3), and each restraining component (3) includes a limiting portion (31), a first mounting portion (32A), and a second mounting portion (32B), each The limiting portion (31) is respectively covered on each of the battery modules (20), and the first mounting portion (32A) and the second mounting portion (32B) are respectively connected to the limiting portion (31) The two sides along the arrangement direction of the plurality of fixed beams (12) are respectively fixed to the fixed beams (12) on both sides of the corresponding battery module (20).
The battery pack according to claim 16, wherein, for two adjacent restraining members (3), the first mounting portion (32A) of one restraining member (3) and the other The second mounting portion (32B) of the constraining component (3) is fixed to the same fixed beam (12) and superimposed in the height direction.
The battery pack according to claim 17, wherein the entire limiting portion (31) is oriented away from the battery module (32A) and the second mounting portion (32B). 20) protruding in the direction,

There is a first distance L1 between the bottom surface of the first mounting portion (32A) and the top surface of the limiting portion (31), and the bottom surface of the second mounting portion (32B) and the limiting portion (31) ) Has a second distance L2 between the top surfaces;

Wherein, the first distance L1 is greater than the second distance L2.
The battery pack according to claim 18, wherein the plurality of restraint members (3) include three adjacent restraint members (3), which are respectively a first restraint member (3A) and a second restraint member ( 3B) and a third constraining component (3C), the first constraining component (3A), the second constraining component (3B) and the third constraining component (3C) are along the plurality of fixed beams (12) The arrangement direction is set in sequence;

Wherein, the first mounting portion (32A) of the first restricting member (3A) is located below the second mounting portion (32B) of the second restricting member (3B), and the second restricting member The first mounting portion (32A) of (3B) is located below the second mounting portion (32B) of the third restraining member (3C).
The battery pack according to any one of claims 17 to 19, wherein the limiting portion (31) as a whole is oriented away from the first mounting portion (32A) and the second mounting portion (32B). The direction of the battery module (20) is protruding, and the two adjacent restraining members (3) are the fourth restraining member (3D) and the fifth restraining member (3E), respectively,

In the fourth restricting member (3D), between the bottom surface of the first mounting portion (32A) and the top surface of the limiting portion (31) and the bottom surface of the second mounting portion (32B) and There is a first distance L1 between the top surfaces of the limiting parts (31);

In the fifth restricting member (3E), between the bottom surface of the first mounting portion (32A) and the top surface of the limiting portion (31) and the bottom surface of the second mounting portion (32B) and There is a second distance L2 between the top surfaces of the limiting parts (31);

The fourth constraining component (3D) and the fifth constraining component (3E) are alternately arranged along the arrangement direction of the plurality of fixed beams (12), and the first distance L1 is greater than the second distance L2 .
The battery pack according to any one of claims 18 to 20, wherein the thickness of the first mounting portion (32A) is t, which satisfies L1-L2≥t.
The battery pack according to any one of claims 17 to 21, further comprising a plurality of fasteners (5),

The first mounting portion (32A) is provided with a plurality of first mounting holes (321A) at intervals along the length direction of the fixed beam (12), which overlap the first mounting portion (32A) in the height direction The second mounting portion (32B) is provided with a plurality of second mounting holes (321B) at intervals along the length direction of the fixed beam (12);

Each of the fasteners (5) passes through the second mounting hole (321B) and the first mounting hole (321A) in the corresponding position in sequence, and is fixed to the corresponding fixed beam (12).
The battery pack according to claim 22, wherein the first mounting portion (32A) is located at the second mounting portion (32B) superimposed on the first mounting portion (32A) in the height direction , The diameter of the second mounting hole (321B) is smaller than the diameter of the first mounting hole (321A).
The battery pack according to any one of claims 16 to 23, wherein a reinforcing rib (33) is provided on the limiting portion (31).
The battery pack according to any one of claims 16 to 24, wherein the first mounting portion (32A) is provided with a plurality of first mounting holes (321A) at intervals along the length direction of the fixed beam (12), The second mounting portion (32B) is provided with a plurality of second mounting holes (321B) at intervals along the length direction of the fixed beam (12); the battery pack further includes:

A plurality of first fasteners (5A), the plurality of first fasteners (5A) respectively pass through the corresponding first mounting holes (321A) and are fixed to the first mounting portion (32A) The corresponding fixed beam (12); and

A plurality of second fasteners (5B), the plurality of second fasteners (5B) respectively pass through the corresponding second mounting holes (321B) and are fixed to the second mounting portion (32B) The corresponding fixed beam (12);

Wherein, the adjustment amounts of the first mounting hole (321A) and the second mounting hole (321B) in the arrangement direction of the plurality of fixed beams (12) are different.
The battery pack according to claim 25, wherein the first mounting hole (321A) is a round hole, and the second mounting hole (321B) is provided on a side wall away from the limiting portion (31) An opening (323), the opening (323) penetrates in the thickness direction of the second mounting portion (32B), and the dimension in the length direction of the fixing beam (12) is not less than that of the second fastener (5B) The diameter of the first connecting section (51B).
The battery pack according to claim 26, wherein the second mounting hole (321B) is closest to the side wall of the limiting portion (31) and the second mounting portion (32B) is far from the limiting portion The distance L3 between the side surfaces of (31) is greater than the diameter of the first connecting section (51B) of the second fastener (5B).
The battery pack according to any one of claims 25-27, wherein the diameter of the first mounting hole (321A) is the same as the diameter of the arc section of the second mounting hole (321B).
The battery pack according to any one of claims 25-28, wherein the first mounting hole (321A) is a round hole, and the second mounting hole (321B) is along the plurality of fixed beams (12 ) Oblong holes extending in the arrangement direction.
The battery pack according to any one of claims 25-29, wherein the fixed beam (12) is provided with a plurality of beam mounting holes (121) at intervals along its length, and the beam mounting holes (121) are Threaded hole;

The plurality of first fasteners (5A) respectively pass through the first mounting hole (321A) and the beam mounting hole (121) and are fixed to the corresponding first mounting portion (32A) The fixed beam (12), or the plurality of second fasteners (5B) respectively pass through the second mounting hole (321B) and the beam mounting hole (121) and are fixed to the corresponding fixed beam (12).
The battery pack according to any one of claims 25 to 30, wherein the fixed beam (12) is provided with a plurality of beam mounting holes (121) at intervals along its length, and the beam mounting holes (121) are Light hole

The battery pack also includes a plurality of blind rivet nuts (5C), the blind rivet nuts (5C) include a second connecting section (51C) and a second limiting section (52C), each of the blind rivet nuts (5C) The second connecting section (51C) is respectively embedded in each of the beam mounting holes (121), and the second limiting section (52C) is in contact with the top of the fixed beam (12);

The plurality of first fasteners (5A) respectively pass through the first mounting hole (321A) and the inner hole of the blind rivet nut (5C) and are fixed to the corresponding fixing beam (12), Or, the plurality of second fasteners (5B) sequentially pass through the second mounting hole (321B) and the inner hole of the blind rivet nut (5C) and are fixed to the corresponding fixing beam (12).
The battery pack according to claim 31, wherein the diameter of the first mounting hole (321A) and the diameter of the arc section of the second mounting hole (321B) are both larger than the second limit section (52C). ) Of the outline size.
The battery pack according to any one of claims 25 to 32, wherein, for two adjacent restraining members (3), the first mounting portion (32A) of one of the restraining members (3) The second mounting portion (32B) of the other restraining component (3) is fixed to the same fixed beam by the same set of the first fastener (5A) or the second fastener (5B) (12) and superimposed in the height direction, the first mounting portion (32A) is located at the second mounting portion (32B) superimposed on the first mounting portion (32A) in the height direction Above.
A vehicle including:

The vehicle body; and

The battery pack according to any one of claims 1 to 33, wherein the battery pack is provided in the vehicle body.